I don't think either of them are tied to a certain ethnicity, especially in America, the great melting pot. Now, many students at my school classify black names as made up sounding, ending with the -eesha sound or having an apostrophe in the middle of the name (i.e. Tyrus, Letitia and L'Shawn); and many people refer to these names as African American names, which I don't get.
I know an Ivey (pronounced exactly like Ivy- the spelling is her mom's maiden name) and she is of Hispanic descent. I would never assume it belonged to an Asian girl, because there isn't a 'v' sound in Chinese, Japanese and Korean (though I believe either Hindu or Sanskrit does). But I wouldn't be surprised to meet an Asian-American girl with the name; many children from other cultures have Western names.

While certain names do bring out racial and ethnic assumptions from many (i.e. Keisha, Mei-Xing and Krishnan), in the Western world it is generally common for Western names to not have associations to any race, nationality or ethnicity.